Amplifier circuit and method of amplifying a signal in an amplifier circuit
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United States of America Patent
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Mar 24, 2015
Grant Date -
Nov 14, 2013
app pub date -
Jul 15, 2013
filing date -
Aug 3, 2007
priority date (Note) -
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Abstract
An amplifier circuit, comprising: an input, for receiving an input signal to be amplified; a power amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the power amplifier; and a dither block, for dithering the switching frequency of the switched power supply. The dither block is controlled based on the input signal. Another aspect of the invention involves using first and second switches, each having different capacitances and resistances, and using the first or second switch depending on the input signal or volume signal. Another aspect of the invention involves controlling a bias signal provided to one or more components in the signal path based on the input signal or volume signal.
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